Royston (Iceni) Weather Station
Daily Weather Observations - April 2001
| Date | Max | Min | Grass | Earth | Sunshine | Rainfall | Wind | Mean | Max | Cloud | Mean | Mean | Mean | Fog | Fog | Snow | Snow | Hail | Thunder | Date |
| Temp | Temp | Min | (30cm) | (Hrs) | (MM) | Direc- | Wind | Gust | Cover | MSL | Rel. | Temp | (vis.< | (vis.< | or | Lying | 00/00h | 00/00h | ||
| (°C) | (°C) | Temp | Temp | 00/00h | 09/09h | tion | Speed | Speed | (Oktas) | Pressure | Humd | (°C) | 1000m) | 200m | Rain/ | (>50% | ||||
| 09/09h | 09/09h | (°C) | (°C) | 09h | (mph) | (mph) | 09h | (mb) | (%) | 00/00h | 09h | 09h | Snow | cover | ||||||
| 09/09h | 09h | 00/00h | 00/00h | 00/00h | 00/00h | 00/00h | 09h) | |||||||||||||
| 1 | 17.4 | 8.0 | 5.0 | 8.9 | 9.14 | 0.0 | SW | 4.5 | 21 | 5 | 1019.6 | 82.5 | 11.8 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 2 | 19.8 | 7.6 | 3.4 | 9.5 | 7.04 | 2.2 | S | 5.4 | 25 | 4 | 1008.6 | 82.6 | 13.3 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
| 3 | 13.5 | 6.0 | 4.0 | 10.2 | 5.82 | 6.9 | SW | 7.2 | 30 | 1 | 1008.6 | 82.6 | 9.3 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| 4 | 11.1 | 5.9 | 5.5 | 10.0 | 3.85 | 2.7 | W | 10.8 | 37 | 8 | 1001.6 | 81.6 | 7.0 | 0 | 0 | 0 | 0 | 1 | 0 | 4 |
| 5 | 11.5 | 3.5 | 2.1 | 9.2 | 1.45 | 6.2 | S | 9.5 | 41 | 8 | 1005.6 | 90.5 | 7.0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 |
| 6 | 14.0 | 9.0 | 6.9 | 8.9 | 1.89 | 5.0 | SW | 9.4 | 32 | 8 | 999.2 | 84.7 | 10.2 | 0 | 0 | 0 | 0 | 0 | 0 | 6 |
| 7 | 12.5 | 3.6 | 1.9 | 9.1 | 5.80 | 3.6 | SW | 7.1 | 32 | 1 | 998.8 | 83.6 | 6.9 | 0 | 0 | 0 | 0 | 0 | 0 | 7 |
| 8 | 11.3 | 1.7 | -0.6 | 9.1 | 4.66 | 5.7 | NW | 6.3 | 28 | 6 | 1017.1 | 80.4 | 6.5 | 0 | 0 | 0 | 0 | 0 | 0 | 8 |
| 9 | 16.6 | 5.6 | 5.6 | 9.5 | 4.99 | 0.5 | NW | 5.3 | 30 | 8 | 1012.0 | 84.8 | 10.4 | 0 | 0 | 0 | 0 | 0 | 0 | 9 |
| 10 | 11.1 | 7.1 | 6.4 | 10.3 | 0.39 | 0.8 | NW | 8.1 | 32 | 8 | 1013.4 | 82.2 | 8.5 | 0 | 0 | 0 | 0 | 0 | 0 | 10 |
| 11 | 12.7 | 5.6 | 5.6 | 10.0 | 1.25 | 0.0 | N | 4.2 | 23 | 8 | 1027.6 | 83.4 | 7.7 | 0 | 0 | 0 | 0 | 0 | 0 | 11 |
| 12 | 13.2 | 3.6 | 0.0 | 10.0 | 1.18 | TR | W | 2.3 | 18 | 7 | 1030.5 | 77.1 | 7.3 | 0 | 0 | 0 | 0 | 0 | 0 | 12 |
| 13 | 10.4 | 0.7 | -2.5 | 10.0 | 8.78 | TR | N | 1.5 | 16 | 4 | 1032.7 | 67.1 | 4.9 | 0 | 0 | 0 | 0 | 0 | 0 | 13 |
| 14 | 11.0 | 1.7 | -2.1 | 9.5 | 0.00 | 8.9 | SW | 7.1 | 28 | 8 | 1024.2 | 84.2 | 6.4 | 0 | 0 | 0 | 0 | 0 | 0 | 14 |
| 15 | 12.6 | 7.3 | 6.6 | 9.4 | 1.34 | 2.3 | NW | 6.0 | 32 | 7 | 1011.8 | 87.5 | 7.5 | 0 | 0 | 0 | 0 | 0 | 0 | 15 |
| 16 | 10.1 | 4.5 | 2.9 | 9.5 | 0.63 | TR | N | 4.0 | 23 | 8 | 1020.4 | 79.5 | 5.7 | 0 | 0 | 0 | 0 | 1 | 0 | 16 |
| 17 | 10.5 | 0.5 | -3.0 | 9.4 | 5.22 | 1.2 | W | 5.9 | 25 | 4 | 1017.1 | 74.0 | 5.8 | 0 | 0 | 0 | 0 | 0 | 0 | 17 |
| 18 | 8.9 | 1.4 | 0.0 | 9.4 | 4.00 | 0.2 | N | 5.1 | 28 | 7 | 1011.0 | 82.0 | 3.6 | 0 | 0 | 1 | 0 | 1 | 0 | 18 |
| 19 | 9.5 | -0.1 | -3.3 | 8.8 | 6.97 | 0.3 | N | 6.1 | 35 | 2 | 1011.8 | 81.1 | 3.4 | 0 | 0 | 1 | 0 | 1 | 0 | 19 |
| 20 | 8.3 | 1.5 | -1.4 | 8.5 | 1.09 | 2.6 | N | 5.5 | 30 | 8 | 1013.9 | 86.7 | 3.9 | 0 | 0 | 0 | 0 | 1 | 0 | 20 |
| 21 | 10.8 | -0.5 | -2.9 | 8.0 | 2.89 | 0.0 | N | 1.3 | 12 | 6 | 1014.9 | 76.0 | 5.1 | 0 | 0 | 0 | 0 | 0 | 0 | 21 |
| 22 | 11.9 | 2.5 | 1.5 | 8.5 | 3.13 | 4.6 | S | 4.9 | 30 | 6 | 1004.0 | 73.6 | 6.8 | 0 | 0 | 0 | 0 | 0 | 0 | 22 |
| 23 | 12.9 | 5.7 | 5.0 | 9.0 | 3.96 | 0.8 | S | 3.3 | 21 | 8 | 1002.8 | 82.0 | 7.8 | 0 | 0 | 0 | 0 | 0 | 0 | 23 |
| 24 | 11.8 | 4.0 | 3.0 | 9.0 | 0.65 | 3.2 | SE | 4.5 | 23 | 8 | 1001.3 | 89.3 | 7.3 | 0 | 0 | 0 | 0 | 0 | 0 | 24 |
| 25 | 13.5 | 5.5 | 4.0 | 8.8 | 4.98 | 1.1 | S | 5.5 | 28 | 3 | 1002.8 | 84.9 | 8.9 | 0 | 0 | 0 | 0 | 0 | 0 | 25 |
| 26 | 14.5 | 5.6 | 4.0 | 9.4 | 5.75 | 2.4 | SW | 6.1 | 25 | 7 | 1010.5 | 80.4 | 9.6 | 0 | 0 | 0 | 0 | 1 | 0 | 26 |
| 27 | 14.2 | 6.0 | 4.4 | 10.0 | 3.12 | 5.0 | CALM | 2.9 | 16 | 2 | 1010.9 | 75.6 | 10.2 | 0 | 0 | 0 | 0 | 0 | 0 | 27 |
| 28 | 14.6 | 7.3 | 6.2 | 10.6 | 9.54 | 4.9 | SW | 8.6 | 35 | 6 | 1003.4 | 74.1 | 9.5 | 0 | 0 | 0 | 0 | 1 | 0 | 28 |
| 29 | 13.0 | 4.5 | 2.6 | 10.7 | 3.84 | 2.9 | SW | 4.3 | 25 | 4 | 1003.0 | 81.9 | 8.0 | 0 | 0 | 0 | 0 | 1 | 0 | 29 |
| 30 | 14.3 | 3.5 | 0.9 | 11.0 | 6.03 | 0.0 | NE | 2.6 | 16 | 2 | 1012.2 | 69.8 | 9.2 | 0 | 0 | 0 | 0 | 0 | 0 | 30 |
| Mean/Total | 12.6 | 4.3 | 2.4 | 9.5 | 119.38 | 74.0 | X | 5.5 | X | 5.7 | 1011.7 | 80.9 | 7.7 | 0 | 0 | 2 | 0 | 8 | 0 | Mean/Total |
| (-0.2) | (+0.2) | (84%) | (167%) |
Differences from average shown in red. Reference periods used: Temperature 25 Years 1973/1997; rainfall 30 Years 1971/2000; sunshine 30 Years 1961/1990.
Additional Data: Rainfall duration 81.5 hours; air frost duration 5.7 hours.
Click on the links below to view this month's graphs and charts......
1. Daily Maximum, Minimum & Grass Minimum Temperatures
2. Daily Maximum & Minimum Temperatures (with 25 Year Comparative Means)
3. Daily Earth (30 cms Depth) Temperature @ 0900 GMT 4. Daily Rainfall 5. Daily Sunshine
6. Daily Maximum Gust & Mean Wind Speed 7. Daily Wind Direction @ 0900 GMT
8. Daily Mean MSL Air Pressure 9. Daily Mean Relative Humidity
10. Thermograph 11. Barograph 12.Hygrograph 13. Anemograph 14. Wind Direction
15. Sunshine Duration 16. Hyetograph
........and for a text report of the April 2001 Weather in Royston click on the link below
April (since 1973) at Royston (Iceni) Weather Station:
Mean daily maximum temperature (25 years 1973/1997) 12.8°C
Mean daily minimum temperature (25 years 1973/1997) 4.1°C
Highest temperature 23.3°C (20th April 1996); lowest temperature -4.1°C (11th April 1978)
Lowest grass minimum temperature -9.4°C (4th April 1996)
Warmest April 1987 (Mean temperature 11.2°C); coldest April 1978 (Mean temperature 6.2°C)
Average April rainfall (30 years 1971/2000) 44.3 mm
Wettest April 1998 (Rainfall 120.7 mm); driest April 1984 (Rainfall 9.0 mm)
Wettest Day 9th April 1998 (Rainfall 32.0 mm);
Highest number of "rain days" (0.2 mm or more) 26 (1998); lowest number of "rain days" 5 (1976)
Highest number of days with thunder 7 (1998)
Highest number of air frosts 8 (1975)
Highest number of ground frosts 15 (1974, 1984)
Highest number of days with snow falling 5 (1975, 1986)
Highest number of days with snow lying (ground with more than 50% snow cover @ 0900 GMT) 2 (1978, 1983)
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| Early morning sunshine illuminates the Royston Sensory Maze which was created in Priory Gardens in 2000 as part of the Millennium celebrations. This picture is looking northwards towards the Town Hall (just visible in distance) and was taken at 0838 GMT on 3rd April 2001. The temperature is a fairly mild 9.5°C after an overnight minimum of 6.0°C (later rising to a maximum of 13.5°C for the day). A south-westerly wind is blowing across the Priory Gardens, mean speed 5 knots, occasionally gusting to 12 knots. The sunshine total for the day was 5.8 hours. | Aircraft contrails criss-cross the sky on a beautiful Spring afternoon in this eastwards looking view across the Greneway School playing field in Royston at 1510 GMT on 9th April 2001. The day was very mild and this photograph was taken just as the temperature reached its maximum of 16.6°C for the day. A light WSW breeze of mean speed 3 knots gusting to 8 knots is drifting across Royston, and a sunshine total of 5.0 hours had accumulated by the end of the day. Hyde Hill can be seen in the distance. | Masses of daffodils are an annual feature around the Town Hall car park and Health Centre in Royston. This is the view looking northwards (towards Cambridge) along the Melbourn Road from a point close to the Town Hall at 0853 GMT on 17th April 2001. After an overnight minimum of 0.5°C (at 0455 GMT) the temperature has risen rapidly to 6.7°C at the time of the photograph, and later reached a maximum for the day of 10.5°C, almost 2.5°C below the 25 Year average for this day. The wind is westerly, mean speed 5 knots, gusting to 12 knots. |
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(This page last updated 11th May 2001 1958 GMT)